add contribution from @arvidbjorkstrom to README
add contribution from @arvidbjorkstrom to README

ktunkiewicz/chef-nginx,kinesisptyltd/chef-nginx,ktunkiewicz/chef-nginx,phlipper/chef-nginx,ktunkiewicz/chef-nginx,kshmir/chef-nginx,kinesisptyltd/chef-nginx,kshmir/chef-nginx,kshmir/chef-nginx